xcontrol error /object reference invalid error/

[ceties]

Hi all, I just started with Xcontrols. I am trying to create my own Listbox and I don't want to have all the properties code in "display state change" of Facade.vi. So I put a reference of the Listbox into State 1.vi because I thought that this way I could change the properties of the control in the property Vis. But I still get "Object reference is invalid" error. Why? I initialized the reference in "Exec state change". So Why? Thank a lot guys!

LV 8.5, WinXP

[Ton Plomp]

QUOTE(ceties @ Jan 28 2008, 04:53 PM)

Hi all, I just started with Xcontrols. I am trying to create my own Listbox and I don't want to have all the properties code in "display state change" of Facade.vi. So I put a reference of the Listbox into State 1.vi because I thought that this way I could change the properties of the control in the property Vis. But I still get "Object reference is invalid" error. Why? I initialized the reference in "Exec state change". So Why? Thank a lot guys!

LV 8.5, WinXP

In the 'Exec state change' you should set the 'State Changed?' boolean in the 'Action' cluster to true:

For more info see the XControl wiki.

Ton

[ceties]

Thanks a lot. It's in short time second stupid question regarding LabVIEW :headbang:

Nice link btw!